The same blanks were used to make Belgium 2 Franc coins by the u s mint. We made many coins for foreign countries. Biggest date series were made during world war two. Year and country lists have been posted on coin talk.
But you are saying that the slab is wrong, so the fact that it is slabbed is irrelevant. A magnet will easily work through the slab.
I have my magnet in another location. I will test it this weekend. But I believe it to be 100% Steel. Please tell us your magnet results.
The mint used the same planchets to strike 1944 Belgium 2 Franc coins. That is why 1944 steel cents aren't worth as much as 1943 Bronze Cents - they are struck on foreign planchets.
Ok but still I say.. What's the difference? Let's imagine somebody found two mint sealed bags. One bag contains 1943 zinc coated steel Cents and the other 1944 Belgium 2 Francs on zinc coated steel. Both bags were found to contain 1 blank planchet each. Both are still the same.
If they're the exact same planchet, then I can't see how anybody would be able to tell the difference.
@JCro57 So.. Here is the result of my test. I have a magnet that I use for magnet fishing. I slowly placed the magnet over the slab that I own. I'm in shock! The Planchet is not ferromagnetic. It did not stick to my magnet at all. This magnet could pick up to 50 pounds. It can attract ferromagnetic metals from a few inches away quickly. The slab didn't even budge. So you are correct.. It's not a Zinc coated Steel Planchet
I'm a different kind of collector. I find it very interesting that such a huge mistake was done. It's a keeper for me! I just have to note that it is not a Steel Planchet. It's also an educational piece.
@JCro57 Here is another problem slab I own. I'm sure you can figure it quickly! Even Fred Weinberg who submitted it said it was a huge mistake.